2 * udev_device.c - main udev data object
4 * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/ioctl.h>
30 #include <sys/socket.h>
32 #include <linux/sockios.h>
35 #include "udev_rules.h"
38 struct udevice *udev_device_init(void)
42 udev = malloc(sizeof(struct udevice));
45 memset(udev, 0x00, sizeof(struct udevice));
47 INIT_LIST_HEAD(&udev->symlink_list);
48 INIT_LIST_HEAD(&udev->run_list);
49 INIT_LIST_HEAD(&udev->env_list);
51 /* set sysfs device to local storage, can be overridden if needed */
52 udev->dev = &udev->dev_local;
54 /* default node permissions */
56 strcpy(udev->owner, "root");
57 strcpy(udev->group, "root");
62 void udev_device_cleanup(struct udevice *udev)
64 name_list_cleanup(&udev->symlink_list);
65 name_list_cleanup(&udev->run_list);
66 name_list_cleanup(&udev->env_list);
70 dev_t udev_device_get_devt(struct udevice *udev)
73 unsigned int major, minor;
75 /* read it from sysfs */
76 attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
78 if (sscanf(attr, "%u:%u", &major, &minor) == 2)
79 return makedev(major, minor);
84 static int rename_net_if(struct udevice *udev)
90 info("changing net interface name from '%s' to '%s'", udev->dev->kernel_name, udev->name);
94 sk = socket(PF_INET, SOCK_DGRAM, 0);
96 err("error opening socket: %s", strerror(errno));
100 memset(&ifr, 0x00, sizeof(struct ifreq));
101 strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
102 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
104 retval = ioctl(sk, SIOCSIFNAME, &ifr);
106 err("error changing net interface name: %s", strerror(errno));
112 int udev_device_event(struct udev_rules *rules, struct udevice *udev)
116 /* add device node */
117 if (major(udev->devt) != 0 &&
118 (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "online") == 0)) {
119 struct udevice *udev_old;
121 dbg("device node add '%s'", udev->dev->devpath);
123 udev_rules_get_name(rules, udev);
124 if (udev->ignore_device) {
125 info("device event will be ignored");
128 if (udev->name[0] == '\0') {
129 info("device node creation supressed");
133 /* read current database entry, we may want to cleanup symlinks */
134 udev_old = udev_device_init();
135 if (udev_old != NULL) {
136 if (udev_db_get_device(udev_old, udev->dev->devpath) != 0) {
137 udev_device_cleanup(udev_old);
140 info("device '%s' already in database, validate currently present symlinks",
144 /* create node and symlinks */
145 retval = udev_node_add(udev, udev_old);
147 /* store record in database */
148 udev_db_add_device(udev);
150 /* remove possibly left-over symlinks */
151 if (udev_old != NULL) {
152 struct name_entry *link_loop;
153 struct name_entry *link_old_loop;
154 struct name_entry *link_old_tmp_loop;
156 /* remove still valid symlinks from old list */
157 list_for_each_entry_safe(link_old_loop, link_old_tmp_loop, &udev_old->symlink_list, node)
158 list_for_each_entry(link_loop, &udev->symlink_list, node)
159 if (strcmp(link_old_loop->name, link_loop->name) == 0) {
160 dbg("symlink '%s' still valid, keep it", link_old_loop->name);
161 list_del(&link_old_loop->node);
164 udev_node_remove_symlinks(udev_old);
165 udev_device_cleanup(udev_old);
172 if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
173 dbg("netif add '%s'", udev->dev->devpath);
174 udev_rules_get_name(rules, udev);
175 if (udev->ignore_device) {
176 info("device event will be ignored");
180 /* look if we want to change the name of the netif */
181 if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
184 retval = rename_net_if(udev);
187 info("renamed netif to '%s'", udev->name);
189 /* export old name */
190 setenv("INTERFACE_OLD", udev->dev->kernel_name, 1);
192 /* now fake the devpath, because the kernel name changed silently */
193 pos = strrchr(udev->dev->devpath, '/');
196 strlcat(udev->dev->devpath, udev->name, sizeof(udev->dev->devpath));
197 strlcpy(udev->dev->kernel_name, udev->name, sizeof(udev->dev->kernel_name));
198 setenv("DEVPATH", udev->dev->devpath, 1);
199 setenv("INTERFACE", udev->name, 1);
205 /* remove device node */
206 if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
207 struct name_entry *name_loop;
209 /* import and delete database entry */
210 if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
211 udev_db_delete_device(udev);
212 if (udev->ignore_remove) {
213 dbg("remove event for '%s' requested to be ignored by rule", udev->name);
216 /* restore stored persistent data */
217 list_for_each_entry(name_loop, &udev->env_list, node)
218 putenv(name_loop->name);
220 dbg("'%s' not found in database, using kernel name '%s'", udev->dev->devpath, udev->dev->kernel_name);
221 strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
224 udev_rules_get_run(rules, udev);
225 if (udev->ignore_device) {
226 info("device event will be ignored");
230 retval = udev_node_remove(udev);
234 /* default devices */
235 udev_rules_get_run(rules, udev);
236 if (udev->ignore_device)
237 info("device event will be ignored");